280530500 has 24 divisors (see below), whose sum is σ = 612679704. Its totient is φ = 112212000.

The previous prime is 280530493. The next prime is 280530511. The reversal of 280530500 is 5035082.

It can be written as a sum of positive squares in 4 ways, for example, as 3041536 + 277488964 = 1744^2 + 16658^2 .

It is a super-2 number, since 2×280530500² = 157394722860500000, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 280031 + ... + 281030.

It is an arithmetic number, because the mean of its divisors is an integer number (25528321).

Almost surely, 2^280530500 is an apocalyptic number.

280530500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

280530500 is an abundant number, since it is smaller than the sum of its proper divisors (332149204).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

280530500 is a wasteful number, since it uses less digits than its factorization.

280530500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 561080 (or 561068 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 280530500 is about 16749.0447488805. The cubic root of 280530500 is about 654.6261682055.

Adding to 280530500 its reverse (5035082), we get a palindrome (285565582).

The spelling of 280530500 in words is "two hundred eighty million, five hundred thirty thousand, five hundred".